From 0ce35b8ce8b9e06a4dedc62b4fe10261db67f0a3 Mon Sep 17 00:00:00 2001 From: Dale Curtis Date: Mon, 5 Jan 2015 16:34:17 -0800 Subject: [PATCH] mov: Fix negative size calculation in mov_read_default(). The previous code assumed if an atom was marked with a 64-bit size extension, it actually had that data available. The new code verfies there's enough data in the atom for this to be done. Failure to verify causes total_size > atom.size which will result in negative size calculations later on. Found-by: Paul Mehta Signed-off-by: Dale Curtis Signed-off-by: Michael Niedermayer (cherry picked from commit 3ebd76a9c57558e284e94da367dd23b435e6a6d0) Signed-off-by: Michael Niedermayer --- libavformat/mov.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavformat/mov.c b/libavformat/mov.c index 11fdcf0194..47f0073df0 100644 --- a/libavformat/mov.c +++ b/libavformat/mov.c @@ -3431,7 +3431,7 @@ static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom) } } total_size += 8; - if (a.size == 1) { /* 64 bit extended size */ + if (a.size == 1 && total_size + 8 <= atom.size) { /* 64 bit extended size */ a.size = avio_rb64(pb) - 8; total_size += 8; }